Mitsubishi Montero Sport (2004+). Manual - part 693

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-337

.

CIRCUIT OPERATION
If a fail-safe is triggered while driving forward, the 
PCM flashes the "N" range light once per second 
(triggered fail-safe). The PCM does this by switching 
battery positive voltage to terminal 121.

.

DTC SET CONDITIONS
If the PCM detects a fail-safe condition, it will attempt 
to illuminate the "N" range light. The PCM sends a 12 
volts pulse for 60 

− 180 ms. If it does not detect a 

voltage drop during the pulse, it waits about 60 sec-
onds and pulses 12 volts again for 60 

− 180 ms. If 

the PCM does no detect the voltage drop before the 
ignition switch is turned the "LOCK" (OFF), the PCM 
will consider it as an short circuit of the "N" range 
light circuit and DTC 56 is set.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Defective "N" range light bulb

• Damaged harness, connector

• Malfunction of the PCM

AC202317

PCM

120

107

119

106

129 130

118

105

117

114115116

126127128

104

111

103

112

108

101102

109110

121122123

124

113

125

CONNECTOR: C-92

C-92 (GR)

AB

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-338

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Check the "N" range light bulb.
(1) Turn the ignition switch to the "ON" position.
(2) Move the selector lever to "N" position.

• The "N" range light in the combination meter illuminates.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the "N" range light illuminate?

YES : Go to Step 6.
NO :  Go to Step 2.

STEP 2. Check the "N" range light bulb.
(1) Remove the combination meter. Refer to GROUP 54A, 

Chassis Electrical 

− Combination Meters Assembly and 

Vehicle Speed Sensor 

P.54-119

.

(2) Check the "N" range light bulb.
Q: Is the bulb in good condition?

YES : Go to Step 3.
NO :  Replace the "N" range light bulb.

STEP 3. Check combination meter connectors C-03 and 
C-04 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 4.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC203173

49

48

50

46

45

44

41 42 43

47

31 32

30

29

27

28

26

25

23

22

24

21

CONNECTORS: C-03, C-04

C-03

C-04

C-03

C-04

AB

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-339

STEP 4. Measure the resistance at combination meter 
connector C-04.

(1) Disconnect connector C-04 and measure at the harness 

side.

(2) Measure the resistance between terminal 31 and ground.

• The measured resistance should be less than 2 ohms.

Q: Is the measured resistance less than 2 ohms?

YES : Go to Step 6.
NO :  Go to Step 5.

STEP 5. Check the harness for open circuit or damage 
between combination meter connector C-04 terminal 31 
and body ground.

Q: Is the harness wire in good condition?

YES : Go to Step 8.
NO :  Repair or replace the harness wire.

AC202498

31 32

30

29

27

28

26

25

23

22

24

21

CONNECTOR: C-04

AB

C-04

AC103776AC

C-04 HARNESS

CONNECTOR: 

COMPONENT SIDE

AC202498

31 32

30

29

27

28

26

25

23

22

24

21

CONNECTOR: C-04

AB

C-04

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-340

STEP 6. Check combination meter connector C-03, 
intermediate connectors C-30, C-96 and PCM connector 
C-92 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 7.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC202392

4

3

10 11

9

8

5

12

1
6

2
7

22

9 10

20

19

6 7 8

21

17

1516

5

14

12 13

3

2

4

18

11

1

49

48

50

46

45

44

41 42 43

47

CONNECTORS: C-03, C-30, C-96

C-96

C-30

C-03

C-96

C-30

C-03

AB

AC202317

PCM

120

107

119

106

129 130

118

105

117

114115116

126127128

104

111

103

112

108

101102

109110

121122123

124

113

125

CONNECTOR: C-92

C-92 (GR)

AB